在中学阶段，把在学校里学到的东西进行延伸与学业成绩呈正相关，因此家庭作业的内容变得更加重要。
During the secondary school years, extending what is learned at school is positively related to academic achievement, so the content of homework becomes more important.
在英国，科学教育在中学阶段历来都十分重要。
Science education is very important in secondary school in the UK.
实验结果表明：在中学阶段有必要开展英语课外阅读活动；
The result shows that it is necessary to conduct the extracurricular reading in the middle school.
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